https://www.di.fm/progressivepsy <= Any 24hr stream of non-vocal electronic music should do the trick, but progressive psy is basically a brain hack as far as I can tell.

I find certain kinds of electronic music entertain my lizard-brain sufficiently that I can think clearly and never get those distracting thoughts, "i wonder how my comment's doing on HN", "Have I checked the news recently"... etc.

I owe my PhD to di.fm, I use premium so I don't get ads and I'm very happy with the result.